Can I apply for a 12-month extension based on marriage 7 days before my current extension expires?

Need quick confirmation on something. I'm on a non-o multiple entry based on marriage. I have extended my first entry by 60 days using the visiting family extension. I am about to apply for a 12 month extension based on marriage. Is it ok to apply 7 days before my 60 day extension expires? I have been through this process successfully before but can't remember if there's an amount of time you need to have left on current visa. Would do it earlier but something has come up. Thanks in advance!